Kevin.payne.15 Posted June 13, 2016 Report Share Posted June 13, 2016 Hi there. Does anyone know if there is a resistance difference between a fuel gauge sender from a mk 2 to a mk3 gt6 I have a mk3 and unfortunately ran out of fuel the other day with the gauge reading just under 1/4 full. Getting it home I put 2 gallons in the tank to represent just under 1/4 full, I thought I would simply bend the arm until the gauge read 1/4 Plan was brilliant however when I took a peep at the sender it's a mk2 one. Taking it out of the tank a second time post calibration to test it at the extremes then even with the float fully up (representing a full tank) then the max the gauge reads is 3/4 full at very best So before I swap out the sender unit does anyone know is the mk2 sender is compatible with a mk3 gauge and if there are any tests I need to do before swapping the sender unit out presuming this is in error Thanks Kevin Link to comment Share on other sites More sharing options...
Dick Twitchen Posted June 14, 2016 Report Share Posted June 14, 2016 Kevin, A quick look at Canley Classics catalogues and part numbers indicates the 'original' for a Mk2 is no longer available and use a Mk3. Dick Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 14, 2016 Report Share Posted June 14, 2016 Before you mess with recalibration do check the voltage stabiliser output you need a steady 10.5 volts with engine stopped and when running the old style stabilizer gives a pulsed output to average the voltage pete Link to comment Share on other sites More sharing options...
Kevin.payne.15 Posted June 14, 2016 Author Report Share Posted June 14, 2016 Pete Thanks for this. Where do I find it and what does it look like. If I put a digital meter on it will it smooth sufficiently to get a decent reading? Looks like the mk 3 petrol comes out the top and then runs round a rubber pipe to the boot floor so I'll need to close up the bottom outlet on my tank - is this a bolt job or welding torch? Thanks Kevin Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 14, 2016 Report Share Posted June 14, 2016 Kevin here is a picture from Canley Classics. The voltage stabiliser bolts on the back of the speedo and is part number 148876. A modern meter will give you a decent reading. I have fitted a modern electronic stabiliser and it works very well. http://www.canleyclassics.com/triumph-gt6-mkiii-facia-instruments-and-switches The fuel comes out the mk3 petrol tank at the bottom, if you've taken out the sender unit you can see the hole. Why do you need to close the outlet? Please don't put a welding torch anywhere near the fuel tank. Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 14, 2016 Report Share Posted June 14, 2016 Oh dear, that's new, my last post one moment says welding then wekling. then back again. Time to sign off. Link to comment Share on other sites More sharing options...
Gully Posted June 15, 2016 Report Share Posted June 15, 2016 I think Kevin is looking at the breather pipe which connects to the sender unit in the parts diagram. My sender unit doesn't have this breather port - I suspect this is missing from 'modern' replacements. Gully Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 15, 2016 Report Share Posted June 15, 2016 Yes, I think you're right Gully, my car's a late GT6 and probably different again. The breather pipe comes off the inlet pipe close to the petrol cap, under the tank and then through the drain hole. Link to comment Share on other sites More sharing options...
Kevin.payne.15 Posted June 15, 2016 Author Report Share Posted June 15, 2016 Well when I looked at the rimmer site for a post 20000 car which is mine then it looks like the fuel gets sucked out the top through a mesh. http://www.rimmerbros.co.uk/Item--i-312415 is the part which is why I presumed a had a replacement tank. Kevin Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 15, 2016 Report Share Posted June 15, 2016 That's very odd Kevin, I've got a late mk3 (February 73) and it has this: http://www.rimmerbros.co.uk/Item--i-215468 Rimmers say this is pre KE20000 but my car is well after that. I've had it nearly 40 years and it's never had a new tank or sender. Could Rimmers have made a mistake? Or were Triumph using up old stock at the end of production? Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 16, 2016 Report Share Posted June 16, 2016 no its done to annoy classic owners 40 years on Ha !!!! Link to comment Share on other sites More sharing options...
Gully Posted June 16, 2016 Report Share Posted June 16, 2016 I see according to Rimmers the fuel tank references are different between early and late GT6s, but my parts catalogue indicates it's not an early / late issue, but Germany v the rest of Europe (US is different again). All done to confuse! Anyway, after all this my early GT6 has the right tank and sender, yet still never reads below 1/4 full! Voltage stabiliser is fine too. Reads perfect accurately from full down to 1/4, then stays there. If you lift the sender out, it still reads 1/4! Must try a replacement one day, but I know when it gets to 1/4 I have 50 miles left... Gully Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 16, 2016 Report Share Posted June 16, 2016 That does seem like an arm bending is required to drop the float arm pete Link to comment Share on other sites More sharing options...
Kevin.payne.15 Posted June 17, 2016 Author Report Share Posted June 17, 2016 Yep that's what I did so at least I know what I have left at one point close to empty. I think I'll leave alone now. Kevin Link to comment Share on other sites More sharing options...
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